drm/amd/pm: remove dead code in si_convert_power_level_to_smc

Since gmc_pg is false, setting mcFlags with SISLANDS_SMC_MC_PG_EN  cannot be reach.
Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Suggested-by: Tim Huang <Tim.Huang@amd.com>
Reviewed-by: Tim Huang <Tim.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c

@@ -5467,7 +5467,6 @@ static int si_convert_power_level_to_smc(struct amdgpu_device *adev,
 	int ret;
 	bool dll_state_on;
 	u16 std_vddc;
-	bool gmc_pg = false;
 
 	if (eg_pi->pcie_performance_request &&
 	    (si_pi->force_pcie_gen != SI_PCIE_GEN_INVALID))
@@ -5487,9 +5486,6 @@ static int si_convert_power_level_to_smc(struct amdgpu_device *adev,
 	    (RREG32(DPG_PIPE_STUTTER_CONTROL) & STUTTER_ENABLE) &&
 	    (adev->pm.dpm.new_active_crtc_count <= 2)) {
 		level->mcFlags |= SISLANDS_SMC_MC_STUTTER_EN;
-
-		if (gmc_pg)
-			level->mcFlags |= SISLANDS_SMC_MC_PG_EN;
 	}
 
 	if (adev->gmc.vram_type == AMDGPU_VRAM_TYPE_GDDR5) {